JPH0522909Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an eyeglass frame integrally molded from a polymer having shape memory properties.

<Prior art> Eyeglass frames are generally made from metal and synthetic resin, single metal, or plastic, but eyeglass frames made of metal and synthetic resin are widely used due to design and cost considerations. ing.

In addition, eyeglasses must be easy to wear and lightweight, so in the case of eyeglass frames made of synthetic resin, metal wires are inserted to provide the necessary strength, and the temples can be easily bent. The structure is such that a metal hinge is attached to the connection between the vine and the rim.

<Problem that the invention aims to solve> For this reason, if conventional eyeglass frames made of synthetic resin and metal are dropped, bent by being caught, or bent forcibly, the boundary between the metal and synthetic resin will break. I have a problem that I have to deal with. Additionally, since metals and synthetic resins have different coefficients of expansion, synthetic resins tend to crack when used for long periods of time.

Furthermore, when glasses are used for a long period of time, the temples of the frames gradually expand and deform, making the glasses loose and easy to fall off.

<Means for Solving the Problems> The present invention was made to solve the above problems. The purpose is to provide eyeglass frames that can be used.

To this end, the eyeglass frame of the present invention has a temple, a rim, a nose piece, and a bridge that are integrally molded from a polymer with shape memory properties, and a thin integral hinge is formed at the base of the temple. Ru.

Polynorbornene-based polymers or polyisoprene-based polymers can be used as the polymer having shape memory properties, and eyeglass frames are integrally molded into a predetermined shape using such polymeric materials.

<Functions and Effects of the Invention> Since the eyeglass frame of the invention is integrally molded with a polymer having shape memory properties, for example,
If the tendrils of the frame have expanded due to long-term use, heating the frame with warm air or hot water to a temperature above the glass transition point of the material will return it to its memorized original shape and restore it to a good wearing condition. It can be returned. Also, the rim that holds the lens returns to its initial lens holding shape when heated, so when replacing the lens, stretch the rim a little and remove the lens.
If the lens is then heated with the lens set, the rim will shrink to its original shape and the lens can be fixed easily and reliably. Furthermore, since it is integrally molded only from polymeric materials without using metal, there is no chance of damage or breakage of the temples due to poor bonding with the metal, etc., and the temples are connected to the rim via an integral hinge. It can be opened and closed easily.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a perspective view of the glasses, and FIG. 2 shows a plan view thereof. The glasses frame of this glasses is
A rim 1 into which the lens fits, a bridge 2 connecting the rims 1 on both sides, a nose pad 3 protruding from the inside of the rim 1,
and the temples 4 on both sides connected to the sides of the rim 1,
It is constructed by integrally molding a shape-memory polymer.

As the polymer having shape memory properties, for example, a polynorbornene-based polymer having a molecular weight of 3 million or more and a glass transition point of about 35° C. to which a crosslinking agent and a reinforcing agent are added can be used. Furthermore, some polyisoprene polymers made by mixing trans polyisoprene and cis polyisoprene have shape memory properties, and these can also be used.

When molding eyeglass frames from polynorbornene-based polymers, the material is heated to about 150°C and compression molded for about 10 minutes to integrally mold the eyeglass frames into a predetermined shape. This memorizes the fixed shape of the eyeglass frame.

In order to facilitate opening and closing of the temple 4, a thin integral hinge 5 is formed at the base of the temple 4, that is, at the connection point with the rim 1. This integral hinge 5 is constructed by forming an arcuate part with a certain degree of curvature into a thin wall to prevent fatigue due to stress concentration.
The structure allows the temple 4 to be opened and closed repeatedly at room temperature. Of course, this part is also molded with shape memory polymer, so when heated with hot water etc., the vine 4
Even if the temples 4 are bent to the closed state, the temples 4 return to the open state, that is, the state in which the glasses are worn.

In this way, eyeglass frames are integrally molded from polymers that have shape memory properties, so for example, the temples 4 of the frame may deform due to long-term use, or the frame may be deformed by applying unnecessary stress. Even if the frame is damaged, by heating the frame with warm air or hot water to a temperature higher than the glass transition point of the material, it will return to its original memorized shape and can be used again in good condition. Also, the rim 1 that holds the lens returns to its initial lens holding shape when heated, so when replacing the lens, you can stretch the rim 1 a little to remove the lens, and then heat it with the lens set. It shrinks to its original shape, allowing the lens to be fixed easily and reliably.

Furthermore, the eyeglass frames of the present invention do not use metal and are integrally molded only from polymer materials, so
It can be manufactured at a low cost and is lightweight, and the temples will not be damaged or broken due to poor bonding with metal, and the temples are connected to the rim via an integral hinge, so they can be opened and closed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of the glasses, and Fig. 2 is a plan view thereof. 1...Rim, 2...Bridge, 3...Nose pad,
4... Vine, 5... Integral hinge.

Claims (1)

[Scope of utility model registration request] Polymers with shape memory properties allow vines,
An eyeglass frame characterized in that a rim, a nose pad, and a bridge are integrally molded, and a thin integral hinge is formed at the base of the bridge.